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As Seen In Modern Machine Shop

When 30K Is Not "High Speed"
With small tools, the speed that can be achieved with an add-on air-powered spindle may be needed just to use the tools effectively.

Air-Powered High Speed Spindle
Two different designs for this spindle allow it to be mounted on a lathe's turret or slide (like an add-on live-tool spindle) or mounted in a machining center's toolholder. In either case, the spindle is capable of 30,000 rpm. When driven by an 80-psig shop air supply, the spindle can deliver 75 W of cutting power.